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有三所房子，三座公共事业站，水、煤气和电 …
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你只能使用任何字母一次，你能用英文写下的 …
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请分别从竹和木中移动2根火柴棒，移动石中 …
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美国内战爆发前，两位名人决斗。挑选助手的 …
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你的车车头朝东，停在一条笔直的公路上。你 …
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能否只改变两根火柴杆的位置，使下面这条鱼 …
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夫妇俩刚盖好房子，因为夜晚会非常冷，所以 …
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一个人正在考察一座大山。他脚下突然一滑， …
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